CONTROL OF WESTERN CORN ROOTWORM (Diabrotica virgifera virgifera LeConte) IN CORN PRODUCTION OF EASTERN CROATIA
A new insect pest - the western corn rootworm (Diabrotica virgifera virgifera LeConte) was identified in Croatia in 1995. The first objective of this research was to determine the population density of all stages, except eggs in commercial cor fields. The second objective was to investigate the ef...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Faculty of Agrobitechnical Sciences Osijek
2003-12-01
|
| Series: | Poljoprivreda |
| Subjects: | |
| Online Access: | http://poljoprivreda.pfos.hr/upload/publications/4_DZOIC.pdf |
| Summary: | A new insect pest - the western corn rootworm (Diabrotica virgifera virgifera LeConte) was identified in
Croatia in 1995. The first objective of this research was to determine the population density of all stages,
except eggs in commercial cor fields. The second objective was to investigate the efficacy of three
organophosphate insecticides on larvae. The experiment was conducted in Gunja, Croatia in 1999 and 2000.
Treatments were commercial corn hybrids (OSSK 444, OSSK 552, Florencia,) and three soil insecticides
(terbuphos, chlorpyriphos-ethyl, chlormephos) applied at planting. Results showed the highest number of
larvae per plant (0.70) in the untreated plot of OSSK 552. In 1999, significant differences in larval numbers
occurred among hybrids, but not among the insecticides. In 2000, larval numbers only differed statistically
between the insecticide treatments. The highest beetles population counted per plant was 0.55 in 2000. This
population level is very close to economic threshold of 0.70 beetles per plant. Significant differences in beetle
numbers per plant between hybrids were only detected in 2000. Pheromone traps containing the lure,
Csal♀m♂N, caught significantly more beetles than the Multigard yellow sticky-trap. Terbufos was the only
soil insecticide providing a significant yield advantage to the hybrids. Based on the current value of corn and
cost of insecticide, terbufos is the only soil insecticide cost-effective for growers. These studies should be
conducted with other insecticides, and growers should avoid planting corn after corn in their fields. |
|---|---|
| ISSN: | 1330-7142 1848-8080 |